linux-kernel - Re: [PATCH] irqchip/irq-mst: Support polarity configuration

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Message-ID: <874khorux9.wl-maz@kernel.org>
Date:   Sat, 06 Mar 2021 18:36:34 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Mark-PK Tsai <mark-pk.tsai@...iatek.com>
Cc:     Daniel Palmer <daniel@...ngy.jp>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <yj.chiang@...iatek.com>
Subject: Re: [PATCH] irqchip/irq-mst: Support polarity configuration

On Fri, 05 Mar 2021 12:09:30 +0000,
Mark-PK Tsai <mark-pk.tsai@...iatek.com> wrote:
> 
> Support irq polarity configuration and save and restore the config
> when system suspend and resume.
> 
> Signed-off-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com>
> ---
>  drivers/irqchip/irq-mst-intc.c | 87 ++++++++++++++++++++++++++++++++--
>  1 file changed, 84 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/irqchip/irq-mst-intc.c b/drivers/irqchip/irq-mst-intc.c
> index 143657b0cf28..979a4d55bcb1 100644
> --- a/drivers/irqchip/irq-mst-intc.c
> +++ b/drivers/irqchip/irq-mst-intc.c
> @@ -13,15 +13,25 @@
>  #include <linux/of_irq.h>
>  #include <linux/slab.h>
>  #include <linux/spinlock.h>
> +#include <linux/syscore_ops.h>
>  
> -#define INTC_MASK	0x0
> -#define INTC_EOI	0x20
> +#define INTC_MASK		0x0
> +#define INTC_REV_POLARITY	0x10
> +#define INTC_EOI		0x20
> +
> +#ifdef CONFIG_PM_SLEEP
> +static LIST_HEAD(mst_intc_list);
> +#endif
>  
>  struct mst_intc_chip_data {
>  	raw_spinlock_t	lock;
>  	unsigned int	irq_start, nr_irqs;
>  	void __iomem	*base;
>  	bool		no_eoi;
> +#ifdef CONFIG_PM_SLEEP
> +	struct list_head entry;
> +	u16 saved_polarity_conf[DIV_ROUND_UP(64, 16)];

Where is this 64 coming from?

> +#endif
>  };
>  
>  static void mst_set_irq(struct irq_data *d, u32 offset)
> @@ -78,6 +88,16 @@ static void mst_intc_eoi_irq(struct irq_data *d)
>  	irq_chip_eoi_parent(d);
>  }
>  
> +static int mst_irq_chip_set_type(struct irq_data *data, unsigned int type)
> +{
> +	if (type == IRQ_TYPE_LEVEL_LOW) {
> +		mst_set_irq(data, INTC_REV_POLARITY);
> +		type = IRQ_TYPE_LEVEL_HIGH;
> +	}

If you are introducing a irq_set_type callback, you need to return an
error for the settings you don't handle.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.